Atheism vs. Christianity?

Hello all, I am an atheist. I know why I am an atheist. A Christian friend of mine (a very ignorant one, at that) wants to have a 'debate' about Atheism vs. Christianity. I've never spoken out in public about my secular views before. I am an excellent public speaker and debater, but I was wondering if... show more Hello all,
I am an atheist. I know why I am an atheist. A Christian friend of mine (a very ignorant one, at that) wants to have a 'debate' about Atheism vs. Christianity. I've never spoken out in public about my secular views before. I am an excellent public speaker and debater, but I was wondering if some of you fellow Atheists could give me a few tips, so I could help strengthen my arguement.
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